Modular Bicycle Drive System for Frame Compatibility
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Solution Overview
Problem
Existing bicycle auxiliary mid-drive systems face issues with large motor dimensions, limited ground clearance, and poor compatibility with different bicycle frame types and spindle standards, failing to meet user customization needs.
Innovation Solution
A modularized bicycle drive system comprising a drive unit with a motor, planetary gear deceleration mechanism, and a mounting unit with adjustable support plates and shims, allowing for customizable installation on various bicycle frames and spindle types, ensuring sufficient ground clearance and adaptable power assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large motor is used to provide sufficient power assist, then the power output is improved, but the ground clearance is reduced and compatibility with different bicycle frames is worsened
Solution Approach 1:
The drive system is divided into separate modular components: the motor unit, the mounting unit, and the second stage deceleration unit. This segmentation allows each component to be optimized independently and enables flexible configuration to suit different bicycle frame types and power requirements, resolving the contradiction between power output and adaptability.
Solution Approach 2:
The mounting unit is designed with universal adaptability to accommodate different bicycle frame types (road bikes, mountain bikes, city bikes) and various spindle standards (BSA 68-83, 100, 120, BB92, BB107). The modular design with interchangeable parts enables the same motor unit to serve multiple functions across different bicycle applications, maintaining high power output while achieving broad compatibility.
2Power
If a large motor is used to provide sufficient power assist, then the power output is improved, but the ground clearance is reduced
Solution Approach 1:
The system uses a two-stage deceleration approach where the first stage is integrated with the motor and the second stage is arranged externally. This dimensional separation allows the motor to be positioned higher on the bicycle frame, improving ground clearance while the external second stage deceleration unit handles the remaining gear reduction, maintaining high power output capability.
3Ease of manufacture
If the motor unit shape is fixed to simplify design, then manufacturing is easier, but the mounting orientation flexibility is reduced
Solution Approach 1:
The mounting unit incorporates adjustable and reconfigurable mounting structures that can adapt to different mounting orientations and positions. This dynamic design allows the motor unit to be mounted in various configurations (horizontal, vertical, angled) depending on the bicycle frame type, maintaining design simplicity while achieving mounting flexibility for road bikes, mountain bikes, and city bikes.
4Adaptability or versatility
If different spindle standards are accommodated with multiple specialized components, then compatibility is improved, but device complexity increases
Solution Approach 1:
The mounting unit is designed as a universal interface that can accommodate multiple spindle standards (BSA 68-83, 100, 120, BB92, BB107) using a standardized set of interchangeable components. This universal design approach allows a single mounting unit to serve multiple functions across different spindle types without requiring entirely separate specialized components for each standard, thus improving compatibility while controlling complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modular system provides flexible customization, increased safety with high-power output, and improved compatibility with different bicycle frames, enhancing user experience by providing efficient power assistance while maintaining sufficient ground clearance and adaptability.
Implementation Method 1
a first stage deceleration unit having an input part connected to the output shaft of the motor unit to transmit a drive force from the motor unit to the first stage deceleration unit
Data Source
AI summary
The invention discloses a bicycle drive system (10) and a kit. The drive system comprises a drive unit (15) comprising a housing, a motor unit (20) having a stator (21), a rotor (22) and an output shaft and accommodated in the housing, and a first stage deceleration unit (30) having an input part connected to the output shaft of the motor unit and an output part; a mounting unit (50) configured to secure and hold the drive unit on a bicycle body (70); and a second stage deceleration unit (40) arranged external to the drive unit and detachably mounted on the first stage deceleration unit for connection to a pedal assembly (80) to transfer a drive force from the output part of the first stage deceleration unit to chainrings (82) of the pedal assembly. The drive unit, the mounting unit and the second stage deceleration unit are each provided as a modular part for assembling to the bicycle. The invention provides a customizability of the drive system.